“Social Impacts” mean the consequences to human populations of any public or private actions that alter the ways in which people live, work, play, relate to one another, organize to meet their needs and generally cope as members of society. The term also includes cultural impacts involving changes to the norms, values, and beliefs that guide and rationalize their cognition of themselves and their society.

To predict what the probable impact of development will be, we seek to understand the past behavior of individuals and communities affected by agency actions, development, or policy changes.
We use a comparative SIA (Social Impact Assessment) method to study the course of events in a community where an environmental change has occurred, and extrapolate from that analysis what is likely to happen in another community where a similar development or policy change is planned.